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Corneal Ulcers: Symptoms, Causes, and Treatment
Causes and Risk Factors
Corneal ulcers can develop from both infectious and non-infectious sources. Understanding what causes them can help you take steps to protect your eyes.
When the protective outer layer of the cornea is disrupted, microorganisms can invade and cause an infection. Common infectious sources include:
- Bacteria such as Pseudomonas or Staphylococcus, which are frequently linked to improper contact lens hygiene or wearing lenses overnight
- Viruses such as herpes simplex virus (HSV) or the varicella-zoster virus that causes shingles, which can reactivate and cause recurring ulcers
- Fungi, which are most often introduced through an eye injury involving plant matter such as a tree branch or contaminated soil
- Parasites like Acanthamoeba, a rare but serious cause associated with exposure to tap water, swimming pools, or hot tubs, particularly in contact lens wearers
The cornea can also be damaged without an active infection. Non-infectious causes of corneal ulcers include:
- Eye injuries including scratches, chemical burns, or a foreign object that disrupts the corneal surface
- Severe dry eye disease, which weakens the corneal surface and reduces its ability to heal and defend itself
- Incomplete eyelid closure from conditions such as Bell's palsy, which leaves the cornea exposed and prone to drying out
- Autoimmune conditions like rheumatoid arthritis or lupus, which can trigger inflammation that damages the cornea from within
Certain habits and health conditions make a person more likely to develop a corneal ulcer. The most common risk factors include:
- Wearing contact lenses, especially sleeping in them or following poor cleaning and storage habits
- A previous history of eye infections such as viral keratitis caused by the herpes simplex virus
- Chronic dry eye or eyelid problems that prevent complete, protective blinking
- Long-term use of steroid eye drops, which can reduce the eye's natural immune response
- Recent eye injury or surgery that has compromised the corneal surface
- Systemic conditions such as diabetes or a weakened immune system that can slow healing
How a Corneal Ulcer Is Diagnosed
Accurate diagnosis is the foundation of effective treatment. Our eye doctors use a combination of clinical examination and targeted testing to confirm the ulcer and identify its cause.
A slit lamp is a specialized microscope with a bright, focused beam of light that allows your eye doctor to examine the cornea at high magnification. A harmless yellow dye called fluorescein is often applied to the eye, causing the ulcer to glow under blue light so that its exact size, shape, and depth can be assessed.
If an infection is suspected, your eye doctor may gently collect a small sample of cells from the surface of the ulcer using a sterile swab. This sample is sent to a laboratory where it is cultured to identify the specific organism responsible, whether bacterial, viral, or fungal, so that the most targeted medication can be prescribed.
In more complex cases, non-invasive imaging technology may be used to create detailed images of the cornea's layers. This type of imaging can help detect certain organisms such as fungi or Acanthamoeba, measure the depth of the ulcer, and track how well the cornea is responding to treatment over time.
Treatment Options for Corneal Ulcers
Treatment is directed at eliminating the underlying cause, relieving pain, and supporting safe healing to preserve vision. Your treatment plan will be tailored to the specific cause and severity of your ulcer.
The primary goals of treatment are to stop the infection or underlying cause, reduce inflammation, and prevent permanent scarring of the cornea. Early and consistent treatment gives you the best chance of a full recovery with minimal impact on your vision.
Medicated eye drops are the first-line treatment for most corneal ulcers. Depending on the cause, your treatment may include:
- Antibiotic eye drops to fight bacterial infections, which may need to be applied very frequently, sometimes every hour in the early stages
- Antiviral eye drops or oral antiviral medications for ulcers caused by the herpes virus or similar viral infections
- Antifungal eye drops, sometimes alongside oral antifungal medications, for fungal infections, which typically require a longer course of treatment
- Anti-inflammatory drops, which may be introduced carefully after the infection is under control to reduce the risk of corneal scarring
- Dilating eye drops and pain relievers to ease discomfort and reduce light sensitivity during the healing process
When a corneal ulcer does not respond to medication or threatens the structural integrity of the eye, a procedure may be necessary. Options include:
- Debridement, which involves the careful removal of infected or dead tissue to allow medication to penetrate more effectively
- An amniotic membrane graft, which applies a specialized biological tissue to protect the eye's surface and promote healing in stubborn cases
- A corneal transplant, where the damaged portion of the cornea is replaced with healthy donor tissue to restore clarity and structural integrity when significant scarring has occurred
Preventing a Corneal Ulcer
Many corneal ulcers are preventable with consistent eye safety habits. Simple, proactive steps can meaningfully reduce your risk.
Always wash your hands before handling contact lenses. Use only approved lens solutions to clean, rinse, and store your lenses, and never use tap water or saliva as a substitute. Avoid sleeping in your lenses unless your eye doctor has specifically approved it, and replace your lens case regularly.
Certified safety glasses or goggles should be worn during activities that carry a risk of eye injury, including yard work, home improvement projects, sports, and any work involving chemicals or flying debris. Protecting the corneal surface from trauma is one of the most effective ways to prevent an ulcer.
Wash your hands thoroughly before touching your eyes or the area around them. Avoid sharing personal items such as towels, eye makeup, or eye drops, as these can transfer bacteria or viruses from one person to another.
If you experience an eye injury, have chronic dry eye disease, or notice any early signs of infection, see your eye doctor promptly. Treating minor issues before they progress is one of the most reliable ways to prevent a small problem from becoming a serious corneal ulcer.
When to Seek Emergency Eye Care
Some symptoms indicate that a corneal ulcer may be worsening rapidly and could threaten your vision. These situations require immediate medical evaluation and should not be waited out at home.
If pain in your eye develops suddenly or escalates to a severe or unbearable level, it may mean the ulcer is spreading or deepening. This is a warning sign that requires same-day evaluation.
A sudden or quickly progressing change in your ability to see, including a noticeable increase in blurriness or a dark spot in your vision, is an eye emergency. Do not delay seeking care if your vision changes unexpectedly.
If redness or swelling in the eye or eyelids appears to be spreading or intensifying over a short period of time, it may indicate that an infection is escalating beyond the corneal surface.
A sudden increase in thick, pus-like, or discolored discharge from the eye is a sign of serious infection. This type of discharge, especially when paired with pain or vision changes, warrants urgent care without delay.
Frequently Asked Questions
These answers address common concerns patients have when dealing with a corneal ulcer, with practical guidance on what to expect and how to make informed decisions about your care.
Unlike many eye conditions that can be monitored over days or weeks, a corneal ulcer can worsen within hours, especially when caused by certain bacteria or Acanthamoeba. The cornea sits directly in the path of light entering the eye, so any scarring that develops at or near its center can result in permanent vision impairment. This combination of rapid progression and proximity to your central vision is what makes early treatment so critical.
No. Contact lens wear must stop immediately if a corneal ulcer is suspected and should not resume until your eye doctor confirms the ulcer has fully healed and clears you to wear lenses again. Continuing to wear a lens over an active ulcer traps bacteria, restricts oxygen to the cornea, and can cause the infection to worsen significantly within a very short time.
Healing time depends on the cause, size, and depth of the ulcer. Many patients notice a reduction in pain and redness within the first two to three days of effective treatment. Smaller ulcers may heal fully in one to two weeks, while deeper or more severe cases, particularly those caused by fungi or Acanthamoeba, can take several weeks or longer. Consistent use of prescribed medications is essential throughout the entire treatment period, even if you feel better sooner.
The vast majority of corneal ulcers respond well to medical treatment without surgery. A corneal transplant is generally only considered when an ulcer has caused deep scarring that significantly impairs vision, has thinned the cornea to a point where its structural integrity is at risk, or has not responded to a thorough course of intensive medication. Your eye doctor will monitor your progress closely and discuss any surgical options only if they become necessary.
Recurrence is possible, particularly for ulcers associated with the herpes simplex virus, severe chronic dry eye, or ongoing eyelid conditions that prevent proper blinking. In some cases, long-term suppressive antiviral therapy or treatment of the underlying condition may be recommended to reduce the chances of a repeat episode. Following your eye doctor's long-term management plan after healing is an important part of preventing recurrence.
Without treatment, a corneal ulcer can deepen and spread rapidly, leading to permanent corneal scarring, severe vision loss, or in the most serious cases, perforation of the eye itself. Even with treatment, delays in seeking care can make outcomes harder to control. The sooner an accurate diagnosis is made and the correct medication is started, the better the chances of preserving clear vision.
Schedule an Appointment at NewView Eye Center
If you are experiencing symptoms of a corneal ulcer or have concerns about your eye health, we encourage you to contact our team right away. At NewView Eye Center, our experienced eye doctors in Northern Virginia are equipped to provide the prompt, expert evaluation and personalized care your eyes deserve. Early intervention makes a meaningful difference, and we are here to help protect your vision at every step.
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